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Buy Octagon Shape 20x15 mm Gems

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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (11): Octagon Shape 20x15 mm Gems Clear All
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Black Gray Hematite Gem - 12.1ct Octagon Cabochon (ID: 498037)

Octagon / Emerald Cut Gray Hematite

12.1ct
20.2 x 15.3 mm
$ 10.12
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Black Gray Hematite Gem - 16.5ct Octagon Cabochon (ID: 498044)

Octagon / Emerald Cut Gray Hematite

16.5ct
19.8 x 15 mm
$ 13.86
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Black Gray Hematite Gem - 20.4ct Octagon Cabochon (ID: 498041)

Octagon / Emerald Cut Gray Hematite

20.4ct
19.8 x 14.8 mm
$ 17.13
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2 pcs
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Black Gray Hematite Gem - 18.4ct Octagon Cabochon (ID: 491900)

Octagon / Emerald Cut Gray Hematite

18.42 ct (total 36.84ctw)
19.2 x 14.6 mm
$ 32.79
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Black Gray Hematite Gem - 18.8ct Octagon Cabochon (ID: 491895)

Octagon / Emerald Cut Gray Hematite

18.76 ct (total 37.51ctw)
19.5 x 14.9 mm
$ 33.38
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2 pcs
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Black Gray Hematite Gem - 17.4ct Octagon Cabochon (ID: 491893)

Octagon / Emerald Cut Gray Hematite

17.44 ct (total 34.87ctw)
19.4 x 15.1 mm
$ 31.03
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Black Gray Hematite Gem - 20.6ct Octagon Cabochon (ID: 491902)

Octagon / Emerald Cut Gray Hematite

20.63 ct (total 41.25ctw)
19.8 x 15.1 mm
$ 36.71
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Black Gray Hematite Gem - 20.3ct Octagon Cabochon (ID: 491896)

Octagon / Emerald Cut Gray Hematite

20.25 ct (total 40.49ctw)
20.2 x 15 mm
$ 36.04
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Lemon Quartz Gem - 23.7ct Octagon / Scissor Cut (ID: 399090)

Octagon / Emerald Cut Yellow Quartz

23.7ct
19.3 x 15.3 mm
$ 37.71
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Lemon Quartz Gem - 34.1ct Octagon Step Cut (ID: 470082)

Octagon / Emerald Cut Yellow Quartz

34.1ct
19.9 x 14.7 mm
$ 35.82
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Colorless Golden Rutile Quartz Gem - 15.3ct Octagon Facet (ID: 402039)

Octagon / Emerald Cut Yellow Rutile Quartz

15.3ct
19.6 x 15 mm
$ 40.77
Item in Stock
Octagon Shape 20x15 mm Gems
Some people by gems by color or price, but for many, it is best to buy gems by shape and size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated Octagon shape / Emerald-Cut, faceted and cabochon gems available now in 20 x 15 mm size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. For calibrated gemstones weighing under one carat, most jewelry settings will accommodate a gem which is within 0.2 mm of the calibrated size in order to fit a standard setting. For gemstones that weigh over one carat, a larger variance is acceptable, often round shape settings will allow 0.3 mm or slightly higher even. This small variance can usually be accommodated for most standard style settings. Round-cut gemstones should also have a greater variance in acceptable size when it comes to calibration; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

Certified Customer Reviews
Overall Rating -> 10 star ratings
My experience with gemselect was awesome so far. I had a few questions about their website and making orders and they replied quickly and were happy to help. I have not received the items I ordered yet as I just ordered them this morning. Although, I truly feel I am going to be a very happy customer once I do receive my items. Gemselect guarantees all their items and have a great return policy just incase. The have a vast selection of all kinds of stones and not to mention their prices are much better than some other websites. Thanks Gemselect I’ll be doing business here from now on!
Posted By Jpapaleo in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
I was very happy on the quality of the gemstones I recieved from GemSelect, I will deffinetly buy again.
Posted By Mckeg in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Great, easy to use, efficient!
Posted By Olive in January, 2019
Source: Bizrate
Overall Rating -> 9 star ratings
Great selection. Love the many learning features like articles and gem information. Prices competitive for natural stones. I do miss not having a selection of lab-made stones, CZ’s, etc, which are useful when price and cost are factors.
Posted By Dirk in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Website easy to navigate.
Posted By RaeRae in January, 2019
Source: Bizrate
Overall Rating -> 9 star ratings
I WOULD RECOMMEND GEM SELECT.
Posted By BO in January, 2019
Source: Bizrate
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart